Drag-saw.



G. J. & 1?. MAY & G. D. SHANNON.

DRAG SAW.

APPLIOATION FILED we. 25, 1909.

964,669, Patented July 19, 1910.

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G. J, & P. MAY 6; G. D. SHANNON.

DRAG EAW.

APPLICATION FILED AUG. 25, 1909.

Patented July 19, 1910.

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UNITED' STATES PATENT OFFICE.

CALEB 3'. MAY, PERRY MAY, AND GEORGE D. SHANNON, 0F ANAGORTES,WASHINGTON.

DRAG-SAW.

Specification of Letters Patent.

Patented July 19, 1910.

To all whom it may concern;

Be it known that we, CALEB J. MAx, PERRY MAY, and GEORGE D. SHANNON,citizens of the United States, residing at Anacortes, in the county ofSkagit and State of WVashington, have invented certain new and usefulImprovements in Drag-Saws, of which the following is a specification.

This invention relates to sawing machines of that class known asdrag-saws and which are employed in cutting logs into short lengths forshingle-bolts, firewood, etc.

The object of the invention is the improvement of machines of thisnature so that the efliciency thereof is increased.

The invention consists in the novel construction, adaptation andcombination of parts, as will be hereinafter described and claimed.

In the accompanying drawings, Figure 1 is a side elevationof a portabledrag-saw embodying our invention. Fig. 2 is a plan view of the same withparts thereof in horizontal section. Fig. 3 is a sectional view takensubstantially through 33 of Fig. 2. Fig. 4 is a perspective view of thesaw-frame and certain associated parts. Fig. 5 is a cross sectional viewtaken through 55 of Fig. 2. Fig. 6 is a detached perspective view of theclutch operating lever. Fig. 7

' is a perspective view of a journal box employed in the illustratedmachine.

The reference numeral 10 designates the runners of a sled whichfurnishes a portable support for the sawing machine proper.

' Secured to the support is a standard comprised of upwardly extendingfront and rear members 11, 11 and 12, 12 which are suitablyconnected atthe top to afford a rigid structure. To one side of the standard is asupport 13 whereupon are secured journalboxes 14 and 14 for atransversely arranged rotary shaft 15. Above the j ournal-bearing 16 forsaid shaft the box 14 is provided with a socket 17 for the reception ofa stud 18 extending from a hollow block 19. A companion block 20 ispivotally supported by its stud 21 by having the latter extend throughan aperture 22 in the outer of the frame members 12. The axes of thesocket 17 and the aperture 22 are in alinement. 23 and 24 are bars whichconstitute the saw frame and are formed of relatively small sizes so asto yieldingly bend to transverse strains. The rear portions of thesebars are slidably seated in the respective blocks 19 shown in Fig. 4, isrigidly connected with the block 20 by a bar 31. The block 30 alsoaccommodates an anti-friction roller 32 positioned to have its peripherycontact with the top edge of the bar. 33 is a link which is connected bya pin 34 with the block 30 and by a pin 35 with the end of a lever 36which is fulcrumed at 37 to the frame-member 12 so that the handle end36 is within convenient reach of the operator when standing to the rearof the machine. This lever is characterized by having the arm to whichthe link is connected bent upwardly, as at 36 so that when the lever ismanipulated to raise the saw into position in which it is indicated bybroken lines a in Fig. 1, the link will be in position b which willcoincide in direction with the lever arm, then at c, to allow a ring'38being placed about the link and the arm to retain the same in conditionto have the saw elevated as, for example, when the machineis to be movedfrom one place toanother.

, The rear end of pitman 28 is connected to the pin of a counterweightedcrank 39 which is fixedly secured to the aforesaid shaft 15. Looselymounted u on the shaft is a gearwheel 40 which is riven from a pinion 41upon the power shaft of a motor 42. To transmit rotary motion from thewheel 40 to shaft 15 we employ clutch devices of a suitable type andpreferably such as illustrated in the drawings. More particularly, thereis provided integrally with the wheel a ring 43 having its innerperiphery machined to coact with a ring 44 which is connected to a bar45 provided with a centrally disposed hub 46 which is fixedly mountedupon the shaft 15. The ring 44 is divided upon one side and intermediatethe parts thereof is the flattened head 47 of a bolt 48 which passesthrough an opening in the bar 45. The outer end of the bolt is securedto the endof an arm 49 having at its other end an adjustable screw 50which is engageable by the conical portion of an element 51 mounted uponthe shaft 15. Said element is provided with a circumferential groove 52for coupling with a lever 53 by which the element may be shifted tocause the conical portionof the latter afiecting the arm 49 to cause itto be swung upon the bolt 48 whereby the head 17 of the same will pressasunder the ends of the ring 14; whereupon this ring will frictionallyengage the ringt for making a driving c011- nection between therotatinggear-wheel and the shaft 15 which effects the operativemovements of the saw. 5a is a rod which is secured to a suitable part ofthe machine frame, as an eye-bolt 55 upon the frame part 13 and has atits opposite end a dogging hook for driving into the log being sawed totemporarily tie the same with the ma chine.

In operation, the shaft 15 is rotated in the direction indicated byarrow W in Fig. 1 and the saw frame 23, 24 is guided by blocks 19, 20and 30 to travel in a plane above the shaft 15 from which thereciprocating movements of the saw are derived. Under such conditionsthe saw will be caused to move in a downward direction in the latterpart of each of its strokes and especially upon the return strokes, whenthe pull exerted through the pitman from the relatively low points inthe travel of the crank-pin acts to bend the saw-frame downwardly with adepressing of the inner end of the saw. While upon the outward strokes,corresponding with the arrow 00, the bending of the frame is minimizedthrough the elevation of the plane of the saws travel being such thatthe thrust of the pitman will be exerted in the direction having but aslight angular variation from the longitudinal axis of the saw frame.These conditions contribute to the efficiency of the machine as thesaw-kerf is cleared of dust, or nearly so, at the termination of eachstroke of the saw thereby permitting of employing lighter constructionfor the various parts of the machine and also requiring less set of thesaw-teeth with correspondingly less duty to be performed thereby.

Having described our invention, what we claim as new and desire tosecure by Letters-Patent, is-

1. A portable drag-saw machine comprising a portable base, a standardmounted upon the base and formed of front and rear members connectedtogether at their top, a support mounted upon the base at one side ofthe standard, journal bearings upon said support, a shaft mounted insaid bearings and projecting from each side of said support, meansengaging with one end of said shaft for operating it, a guide block supported by one of said bearings, a guide block supported by one of saidmembers, a saw frame comprising parallel bars traveling in said guideblocks, a saw connected to the frame, a pitman secured to the forwardend of the frame, a counter-Weighted crank attached to said shaft andhaving one end connected to said pitman and means mounted on thestandard for raising and lowering the saw.

2. A portable drag-saw machine comprising a portable base, a standardfixed thereto, a shaft, journal bearings for said shaft supported uponthe base, means engaged to one end of the base for rotating the shaft, aguide block supported by one of said bearings and a guide blocksupported by said standard, a saw frame comprising parallel barsextending through said guide blocks, a saw fixed to the frame, acounter-balanced crank fixed intermediate its ends to said shaft, apitman connected at one end to one end of said crank and having itsother end attached to the forward end of the saw frame and means mountedupon the standard for raising and lowering the saw.

3. A portable drag-saw machine comprising a base, a shaft, a standardmounted on said base, journal bearings for said shaft supported by thebase, a guide block connected to one of said journal bearings andarranged in a plane above the shaft, a guide block supported by saidstandard and arranged in a plane above the shaft, a saw frame comprisingparallel bars extending through said guide block, a saw fixed to theframe, operative connection between the shaft and said frame for drivingthe saw and means mounted on the standard for elevating and lowering thesaw.

1. A portable drag-saw machine comprising a base, an operating shaft,bearings therefor, a guide block supported by one of said bearings andin a plane above said shaft, another guide block in a plane above saidshaft, means for supporting the last mentioned guide block, a saw framecomprising parallel bars extending through said guide blocks, a combinedcoupling and guide block mounted upon one of the sections of the sawframe and connected to one of the other guide blocks, a link attached tosaid combined coupling and guide block, a lever having an angular endpivoted to said link, a saw secured to the frame, and operativeconnection between the shaft and the frame for driving the saw.

5. A dragsaw machine comprising a saw frame, guides therefor, a sawsecured thereto, a combined coupling and guide block surrounding aportion of the frame and connected to one of said guides, a link pivotedto said combined coupler and guide block, and a pivoted lever having anangular end pivoted to said. link, the angularity of said end being suchthat when the lever is shifted in one direction to elevate the saw, saidend will extend in parallelism with said link whereby they'can becoupled in such position to maintain the saw elevated.

6. A drag-saw machine comprising a pivoted saw frame, a linkpivotally-connected thereto, and a pivoted lever having an angular endarticulated to said link, the angularity of said end being such thatwhen the lever is shifted in one direction the frame will be elevatedand the link will extend in parallelism with respect to said end wherebythe link and end can be coupled together while parallel to maintain thesaw frame in an elevated position.

7. A drag-saw machine comprising a pair of pivoted guide blocks, anoperating shaft arranged below the plane of said blocks, a

saw frame comprising parallel bars extending through the guide blocks, asaw fixed to said frame a counter-weighted crank connected intermediateits ends to said shaft, 20

and a pitman having one end connected to one end of said crank and itsother end attached to the forward end of the frame and constituting anoperative connection between the crank and the saw for driving 25 WV. H.BEARD.

